Try Susan Fox (she no longer writes) and Judy Christenberry (I don't think she writes any longer either). You'll have to buy at used bookstores or online. My favorite Susan Fox book is A Wedding in the Family. Judy Christenberry has written several series that I like; the Randall books and From the Circle K.

A trilogy of books that reminds me of Palmer's older writing is by Barbara McMahon (Wyoming Wedding, Bride on the Ranch, and Angel Bride)

I think Catherine Anderson has a similar style, she written books which are linked eg. bothers, cousins etc Her heroines aren't all virgin/perfect and some of the hero's have issues.. she also writes historicals which are linked to the "current" books too....